Am Samstag 22 Oktober 2005 03:52 schrieb Nathan O. Siemers: > Hello all, > > I've spent the last 5 days trying to fix an issue with a brand new > hp a1250n dual core athlon64 machine. ATI motherboard with embedded > radeon xpress 200 graphics. I've installed the pure64 sarge > distribution. This is my first 64 bit debian attempt, although I am > running a 2 cpu opteron workstation with suse at work. > > The system in many ways okay, but there is a serious problem with > interrupts and clock speed which wreaks general havoc on the machine. > The clock is running about 2x speed - I think perhaps two clock ticks > (from each core?) are happening for each one that should. X windows > keyboard behavior is quite erratic, I often get 2-4 chars repeated for > each key typed. I believe this is consistent with lots of interrupt > activity? > > Summary of my experiments so far: > > 2.6.13.4 kernel > > 1. turning off smp in kernel compile configuration does not correct the > problem. > > 2. no_timer_check and/or notsc does not reliably correct the problem - I > have seen some help for periods of time. > > 3. moving from athlon64 to generic x86_64 during kernel compile does > nothing > > 4. no_timer_check pci=noacpi pci=routeirq kernel boot option corrects > the 2x clock speed problem, but breaks at lot of other things - I am > running this at the moment so I can use the computer (but my firewire > drive is not recognized, for example). > > 5. PM_timer kernel compile option does nothing > > 6. Changing timer frequency does nothing. > > I wanted to check with older 2.6 kernels but experience a failed boot on > stock debian 2.6.8 amd64-smp kernel, I don't this is indicative of a > problem other than misconfiguration of grub or devfs subsystems (there > is a pivot_root at boot time that fails)... > > some interesting log entries: > > kern.log: > Oct 18 14:57:48 localhost kernel: Losing some ticks... checking if CPU > frequency changed. > > Oct 18 23:36:50 line kernel: Your time source seems to be instable or > some driver is hogging interupts > Oct 19 05:40:05 line kernel: rtc: lost some interrupts at 2048Hz. > Oct 19 05:49:33 line kernel: rtc: lost some interrupts at 2048Hz. > > This seems like it could be related to kernel bug 3927: > > http://bugzilla.kernel.org/show_bug.cgi?id=3927 > > which has been marked as "resolved" but my reading suggest that a > sufficient number of people found workarounds to let the bug subside > rather than fixing it... > > In any case, my deep appreciation to anyone who has a solution after > days of kernel recompiles and rebooting with various boot options. > Happy to send more detailed logs and kernel compile options if there is > interest. > > Nathan
Just a little workaround. You need an smp numa kernel. Compile it this 500 hz. Markus -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]